Calcium signaling in plant cell organelles delimited by a double membrane

Increases in the concentration of free calcium in the cytosol are one of the general events that relay an external stimulus to the internal cellular machinery and allow eukaryotic organisms, including plants, to mount a specific biological response. Different lines of evidence have shown that other...

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Bibliographic Details
Published in:Biochimica et biophysica acta 2006-11, Vol.1763 (11), p.1209-1215
Main Authors: Xiong, Tou-Cheu, Bourque, Stéphane, Lecourieux, David, Amelot, Nicolas, Grat, Sabine, Brière, Christian, Mazars, Christian, Pugin, Alain, Ranjeva, Raoul
Format: Article
Language:English
Subjects:
Calcium
Calcium - metabolism
Calcium Signaling
Cell compartmentation
Cell Membrane - metabolism
Cytosol - metabolism
Dynamics of cytosolic and organelle calcium
Organelles - metabolism
Organelles - ultrastructure
Plant cell organization
Plant cell signaling
Plants - metabolism
Plants - ultrastructure
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Summary:Increases in the concentration of free calcium in the cytosol are one of the general events that relay an external stimulus to the internal cellular machinery and allow eukaryotic organisms, including plants, to mount a specific biological response. Different lines of evidence have shown that other intracellular organelles contribute to the regulation of free calcium homeostasis in the cytosol. The vacuoles, the endoplasmic reticulum and the cell wall constitute storage compartments for mobilizable calcium. In contrast, the role of organelles surrounded by a double membrane (e.g. mitochondria, chloroplasts and nuclei) is more complex. Here, we review experimental data showing that these organelles harbor calcium-dependent biological processes. Mitochondria, chloroplasts as well as nuclei are equipped to generate calcium signal on their own. Changes in free calcium in a given organelle may also favor the relocalization of proteins and regulatory components and therefore have a profound influence on the integrated functioning of the cell. Studying, in time and space, the dynamics of different components of calcium signaling pathway will certainly give clues to understand the extraordinary flexibility of plants to respond to stimuli and mount adaptive responses. The availability of technical and biological resources should allow breaking new grounds by unveiling the contribution of signaling networks in integrative plant biology.
ISSN:0167-4889
0006-3002
1879-2596
DOI:10.1016/j.bbamcr.2006.09.024